PHILADELPHIA — Commuters faced slick roads Friday after yet another winter storm delivered snow and ice to the East Coast, leaving at least 24 people dead, including a pregnant woman struck by a mini-plow in New York City whose baby was then born by cesarean section and two Good Samaritans killed when they tried to aid a truck driver on a snow-covered interstate in North Carolina.

The latest go-round of bad weather began overnight in some places — just in time to delay tens of thousands of deliveries of Valentine's Day flowers — as snow, sleet and rain fell on roads already covered in many parts of the Northeast with deep puddles and icy patches.

Numerous traffic accidents involving multiple tractor-trailers and dozens of cars completely blocked one side of the Pennsylvania Turnpike outside Philadelphia on Friday morning and injured more than a dozen people. The crashes were reported about five hours after a storm that dropped a foot of snow finally moved out. Speed restrictions enacted during the storm had been lifted, but motorists say the roadway was very slick.